I don’t agree that revived heroes should start with 0 mana myself, as I think that would gut the talent/skills that resurrect.
However… the Fighter revive talent is incredibly strong. On the one hand, it is luck based and thus not a good thing to rely on. But on the other hand it makes fighting defense teams with fighters incredibly frustrating.
I think that Revive should get a nerf, and it’s a very simple one: If HP > 1, revive can activate.
This isn’t unheard of in other RPGs. For e.g. in the Fire Emblem series, there is an ability called Miracle. It used to work the same way that the Revive talent in this game works. However, it was in later games of the series that they nerfed Miracle to require HP > 1.
The result made Miracle less obnoxious to deal with against enemies, and it also made players rely less on luck to have their heroes survive tough maps.
Personally, I think that Revive should get the same treatment in this game It would make revive less powerful, considering its high activation chance at more nodes though, I think this an okay adjustment.